Ford F150 4x4 Problems IWE Actuators, Vacuum Solenoid Troubleshooting. Get the Vacuum Solenoid https://amzn.to/2KUeUo6
Sometimes when your wheels start grinding or axle clicking in and out this could be a sign of a few things. the Vacuum solenoid up by the passenger firewall, a vacuum leak in the line going to the vacuum hubs or the hubs themselves. at this point you really need to start troubleshooting and see what the issue really is. when it starts does both axles do it or just one side. One side could lean towards bad vacuum or bad hub.
if your in 4wd and won't shift out the solenoid could not be opening back up to let vacuum release the actuators.
if you hear grinding or whining of gears you most likely have a leak in your vacuum system this could be from the line or in my case a blown seal in the actuator itself. please keep in mind that is this is intermitted it may work when you troubleshoot it and everything may seem to be fine.
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